Ta có : x2 + 2x - 3
= x2 - x + 3x - 3
= x(x - 1) + 3(x - 1)
= (x + 3)(x - 1)
x2+2x-3
= ( x + 1 ) ( x - 3 )
Trả lời:
x2 + 2x - 3
= x2 - 3x + x - 3
= ( x2 - 3x ) + ( x - 3 )
= x ( x - 3 ) + ( x - 3 )
= ( x - 3 )( x + 1 )
Trả lời:
x2 + 2x - 3
= x2 + 3x - x - 3
= ( x2 + 3x ) - ( x + 3 )
= x ( x + 3 ) - ( x + 3 )
= ( x + 3 )( x - 1 )